u3 instruction - access prosthetics · preamplifier handling precautions 18 connections 19 testing...

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Instruction ManualFor prosthetists trained to fit the Utah Arm

© Motion Control, Inc., a subsidiary of Fillauer, Inc.115 North Wright Bros. Dr.Salt Lake City UT 84116-2838 USA1 (888) MYO-ARMS (696-2767)1 (801) 326-3434Fax: 1 (801) 978-0848Website: www.UtahArm.comE-mail: [email protected]

Document No. 1910024 - Rev. B Feb 2006

U3

© Motion Control, Inc. www.UtahArm.com

Instruction ManualU3

The first Utah Artificial Arm was developed at theUniversity of Utah by the Center for Engineering Design,directed by Dr. Stephen C. Jacobsen.

The original technology has been further developed byMotion Control, Inc., with the second generation Utah Arm 2released in 1987, and the third generation Utah Arm 3released in 2005. Each new version of the Utah Arm hasrepresented a significant advancement in prosthetictechnology.

Dr. Stephen C. Jacobsen, 1981.

Acknowledgement

4 © Motion Control, Inc. www.UtahArm.com

Instruction ManualU3Section A Overview 6

Names of External Parts 8

Section B EMG Testing 10EMG TESTING AND TRAINING 10Basics of EMG Testing 10Co-contraction Training 13Final Site Selection 14

Section C Preamp Installation 15Electrode Installations in Socket 16Exceptions to normal spacing 17Snap electrode installation 17Preamplifier Handling Precautions 18Connections 19Testing Wires 19Insure Adequate Grounding 21Prevent Moisture Damage 21Sweat Damage Prevention 22

Section D Connections 24Forearm Connection System 24Installation of Passive Wrist 26Installation of Electric Wrist 28Forearm Connection Detail 30Humeral Connection System 33U3 Control and Switch options 34Remote Lock/Unlock Switch options 35Wrist Control Switch options 35Remote Power Switch options 35

Section E Installation of Software 36To Operate the User Interface 37System Set Up 39Organization of the User Interface Software 39

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Table of Contents

Select U3 Configuration 40Select the Control Input 41Electric Wrist Control option 42Terminal Device Selection 43Set Up Summary 44

Section F Elbow Adjustments 46Main Menu 47Input Gain and Threshold Adjustments 48Lock/Unlock 50Freeswing/Relax 52User Settings 53

Section G Saving Adjusted Settings 54Computer File Operations 56How to Print Wearer Profiles 57

Section H Hand Adjustments 58Main Menu 58Input Gain and Threshold Adjustments 59Hand/Wrist Switch Control 61How to use Switch Control to Train the Wearer 63Relax Timer 66Sleep Timer 68User Settings 69

Section I The AutoCal® feature 72How to Start AutoCal 72AutoCal Instructions to the wearer 73

Section J Troubleshooting 74Section K Patient Training 83Appendix 92

a. Technical Specifications of the Utah Arm

Index 93


Instruction ManualU3A. OverviewThe U3 - One step closer to nature

At first glance the U3 looks very similar to earlier Utah Armmodels, but advances in technology allow more input andcontrol options, and make the U3 easier to adjust for bothwearer and prosthetist. Here are some of the importantdifferences you’ll find in the new Utah Arm 3:

• TWO microprocessors allow SIMULTANEOUSelbow and hand functionThe U3 allows the wearer to reach and grasp for anobject at the same time, producing a more naturalmovement than what was possible before. Sequentialcontrol is also available.

• Computer Interface for configuration & adjustmentThe U3 uses a similar microprocessor technologyintroduced by Motion Control in the ProControl 2. TheComputer Interface is easy to use and allows theprosthetist or the wearer to make adjustments easily. Italso helps with the fitting and training process becauseit shows the wearers’ input signals in real time.

• The Utah Arm 3 Computer Interface software is aWindows Version User Interface and includes thefollowing features:• Enables new control options and inputs (see below)

• Works on any Windows OS, including Win XP

• Set-Up WizardGuides you through the setup process step-by-step, OR,

make changes directly to adjustment screens or summaryscreen.• AutoCal® feature

(Optional) Automatic adjustment of Hand gain andthreshold.

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A. Overview

• Electric Wrist Rotation• Hand/Wrist switching by co-contraction.

• “Fast Access” Wrist available.

• “Auto Switch Back” will return to hand automaticallyafter 10 seconds of relaxation.

• Push or pull switches are still available for wrist control(see Chapter 4- Connections).

• Batteries:The new U3 batteries are reconfigured to operate anyterminal device used without having to modify the TD.See TD Options below.

• Variety of input choices:The U3 can operate using any of the following toaccomodate a variety of fitting needs, and can useseparate inputs for hand and elbow.

• Motion Control dual-site EMG preamps with standard orsnap-type electrodes

• Motion Control single-site EMG preamp with standard orsnap-type electrodes

“Alternate Inputs:”

• Motion Control Force Sensor

• Motion Control Linear Potentiometer

• Motion Control Touch Pads

• Multiple TD Options:• Motion Control Hand (or ProHand)

• Motion Control ETD- Electric Terminal Device(or ProETD)

• OB Hand (8E 37)*

• OB Sensor Hand (8E 38=5)*

• OB Greifer (8E 32=12)*

• (Ultralite Centri Hands* will be available in the future).

*Warranty coverage is at the discretion of the TD manufacturer.



External Parts of the Utah Arm 3:(SEE FIGURE 1.1)

1. Ground Electrode

2. Outer Socket

3. EMG Electrodes (with Spacers)

4. Humeral Wire Harness (details on p. 34)

5. U3 4-pin Computer Interface Connector (on left side)

6. Battery Pack

7. Battery fuse

8. Forearm Cover

9. ON-OFF Switch for Arm

10. Lamination Collar and Coaxial Connector and/or ElectricWrist Rotator

11. Motion Control ETD - Electric Terminal Device - Standardversion

12. ETD safety release lever

13. Motion Control Electric Hand - Standard version

14. Hand ON-OFF Switch

15. Forearm Cover Screws (2)

16. Lock Override Button (on right side)

17. Humeral Rotator Clamp Band and Friction AdjustmentScrew

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A. Overview

Before fitting:Before fitting the Utah Arm 3 to a patient, you may want

to operate it yourself to familiarize yourself with its function.Using the Preamplifier Set (e.g., Myolab preamp set or

alternate input, e.g. Linear Potentiometer) you may operatethe U3 yourself. You can then verify all the functionsdescribed in this manual, and experiment with how theiradjustment effects the control of the elbow, hand and wrist.

FIGURE 1.1 EXTERNAL PARTSOF THE UTAH ARM 3(REFER TO PARTS CATALOG FORCOMPLETE PARTS DIAGRAM)


Instruction ManualU3B. EMG Testing and Training

Motion Control’s Myolab II EMG Tester/Trainer isrecommended to test for the best control muscles. TheMyolab II provides enough sensitivity to test and trainmuscles with EMG signals even below the 5 microvoltminimum for Hand Control in the Utah Arm 3. Beforeprobing for EMG electrode sites, examine the patient forproblem areas such as unhealed wounds, scar tissue, painfulareas, and restricted range of motion.

1. Basics of EMG Testinga. Proper Alignment. Align the electrodes along the

general direction of the muscle fibers. For very dry skin, orvery hairy skin, moisten the skin slightly with water toimprove the EMG signal by lowering skin resistance.

b. Good Contact. All the electrodes on the preamplifiermust be in good contact with the skin, as shown in Figure2.1. Hold the electrodes on the skin for a few seconds toestablish good contact between skin and electrodes.

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B. EMG Testing and Training

FIGURE 2.1

c. Evaluate all Potential Sites. All of the remnantmuscles which could be used for control sites should beevaluated before fitting the prosthesis. Begin EMG testingwith the most distal of the remnant muscles. Likely sites onthe forearm for EMG control sites are shown in Figure 2.2.

FIGURE 2.2 FOREARM EMG SITES FOR PROCONTROL/PROHANDFITTINGS

For each potential control site, palpate the muscle as thepatient contracts it and place the preamplifier over the belly ofthe muscle. Touching the muscle may help give the subjectmore sensation of the muscle contraction.


Instruction ManualU3NOTE: Unilateral amputees may be aided in learning tocontract a particular muscle in their remnant limb bymimicking the same function in the sound side arm, e.g.,flexing the sound side elbow and contracting biceps musclessimultaneously in both the remnant arm and the sound arm.

While holding the electrodes over the muscle, instructthe patient to “contract-hold-relax” in about a three secondsequence. A smooth and even contraction is desired,without strenuous effort, with relaxation after eachcontraction. Systematically move the preamplifier by aboutone-half inch (1 cm.) increments testing the entire remnantlimb wherever muscles exist.

d. Mark Location of Sites. When a potential control siteis identified, mark the best electrode location on the skin,and also mark the total area in which an adequate EMGsignal is obtained (see example in Figure 2.3). This will beimportant in locating electrodes in the prosthetic socket.Identify all potential EMG control sites in this manner.

FIGURE 2.3 EXAMPLE: MARKING LOCATION OF BEST TRICEPS EMG

e. Important Note: Optimal Sites. The best pair of EMGcontrol sites are the two muscles which generate the greatestdifference between them. Two muscles which involuntarilyco-contract, will tend to cancel each other’s signal (seeFigure 2.4). However, voluntary co-contraction is desirable,

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B. EMG Testing and Training

to activate the elbow unlock. (See below). If co-contractioncannot be prevented, consider using the “First-Over” controloption. See Section 5, “Selecting the Control Input.”

FIGURE 2.4 DIFFERENCE BETWEEN TWO MUSCLES SHOWN ON THEMYOLAB II.

2. Co-contraction TrainingTo train patients to co-contract and unlock the elbow, instruct thepatient to first relax, then contract both the control musclessimultaneously in a quick but light strength co-contraction,followed by relaxation (much like “snapping” the fingers quickly).

a. Using the Myolab II to monitor activity of theappropriate muscles, have the subject perform thefollowing sequence for practice:

• Step 1: Gradually contract the “A” muscle. Maintain acontraction for one second and then relax.

• Step 2: Gradually contract the “B” muscle. Maintain acontraction for one second and then relax.

• Step 3: Quickly co-contract both the “A” and “B” muscles lightly(about 20 to 30 microvolts), then relax both.

• Step 4: Repeat Step 1.


Instruction ManualU3b. Also practice using the User Interface and the

computer [Switch Control Screen] to give the patientbiofeedback to help train their ability to contract quickly andsimultaneously. Check to be sure that good EMG signaldifferentiation still exists for the muscle pair selected (orchange the control method to “first-over”).

3. Final Site SelectionChoose the final muscle sites only after a reasonable period oftraining and practice, ideally with the patient actuallywearing the entire prosthesis. The minimum criteria are:

a. To operate the Hand in the Utah Arm (or theProControl System), the difference between the “A” and “B”muscle signals must be at least 5 microvolts. The “first-over” control method does not require this difference, butdoes require that the desired muscle contract first.

To measure the EMG signal magnitude accurately, set thegain dial on 10 and the gain switch on X1 (refer to theMyolab II instructions for more details). To operate theelbow in the Utah Arm, approximately 15 microvolts EMGsignal is needed.

b. Co-contraction: For Unlocking the Utah Arm: The twomuscles must be capable of co-contracting quickly andsimultaneously to at least 5 microvolts.

c. The muscle EMG signals should be controllable,without spasms or quivering.

d. Contraction of the muscle should not induce pain.

e. Electrode placement in the prosthesis over scar tissueshould be avoided, due to the danger of tissue breakdown.In some cases, low profile electrodes can be used over scartissue, but such cases should be followed closely to becertain the skin and/or scar breakdown does not occur. Snap

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C. Preamp Installation

electrodes in a gel liner is now possible, which may be moregentle on fragile skin.

Note: The “First Over” control mode may be preferredwhen a high level of co-contraction causes interferencebetween A and B EMG’s.

C. ELECTRODE AND PREAMPINSTALLATION AND HANDLING1. Electrode Installation:

A total of three electrodes are used for each muscle EMGsignal, two sensing and one ground, and may be either high orlow profile stainless steel disks (provided in the Arm Kit), orsnap-type electrodes.

FIGURE 3.1: HIGH PROFILE, LOW PROFILE AND SNAP-TYPEELECTRODES

• Use the high profile electrode: For better electrodecontact on softer, fleshy areas, and where the skin maypull away from the electrode.

• Use the low profile electrode: For intimate-fittingsockets, suction-fit sockets, over scarred or fragile skin,or boney areas.

• Use the snap-type electrode: Usually for roll-on gel liners,but may also be used in firm sockets. Use with snap-typeelectrode leads.


Instruction ManualU32. Installing electrodes in the socket:

a. Drill the holes in the socket with a .20" (5mm) bit.

b. Never grip the electrode edge with pliers; it will scarthe edge, which will scratch the wearer’s skin. If you needto hold the electrode firmly, use adhesive tape, with thesticky side against the electrode surface. Clean off withalcohol later.

c. The electrodes may be used with or without the plasticSpacer Washers. The Spacer Washer is designed toeliminate sharp edges from the electrodes and to improveelectrode contact after some atrophy occurs in the residuallimb. It is not intended as a “spring tension” device (SeeFigure 3.2).

d. The electrode may be used without the Spacer Washer(in an intimate fitting socket). The electrode disk will thenbe flush with the inside socket wall (See Figure 3.3).

e. Normal electrode spacing: 1 3/8" (35mm) apart(center to center).

FIGURE 3.2 ELECTRODE WITH SPACER WASHER, AND WITHOUTSPACER WASHER (NOTE RELIEF IN SOCKET WALL).

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Allowable exceptions to normal spacing:WIDER SPACING (3" max.) (e.g., to prevent perspiration from

shorting between electrodes).Drawback: The EMG signal may diminish with wider spacing. Test

with the Myolab II.CLOSER SPACING (5/8" min.) (e.g., to fit into a short socket)Drawback: Perspiration is more likely to short between electrodes.MULTIPLE ELECTRODES may be used (e.g., where one electrode

may pull away from the skin). Connect electrodes together withthe green wire included with the electrode set.

3. Snap Electrode InstallationReported advantages of roll-on type sockets with myoelectricsystems:

• Improved electrode contact, even after moderate weight gain orloss by the wearer.

• Improved suspension, due to the suction maintained by a well-fitting roll-on liner.

• Improved wearer comfort, especially with problem skin, e.g., scartissue, etc.

FIGURE 3.3. UTAH ARM PARTS REQUIRED FOR USING SNAP-ONELECTRODES.

(Order 2 ea.): Cable adaptor with snap connectors forpreamplifier (p/n: 5030004)(Order 2 sets): Snap type electrodes (p/n: 3010426) /set of 6


Instruction ManualU3For more detailed instructions on using a gel liner with snap-typeelectrodes, visit www.UtahArm.com/srfaq.htm, or call MotionControl.

A FEW PRINCIPLES TO BE FOLLOWED WHENUSING SNAP ELECTRODES:

a. The snap ends should be protected as much aspossible.

b. Avoid tugging and flexing the wires as the socket isdonned.

c. Once installed, the snaps and cables should be held inplace as securely as possible (this will preventdisturbance of the EMG).

d. Avoid any motion of the snap connection as the socketis moved during use of the prosthesis. If cables areexposed, you should supply a protective cover or sleeveover the cables, e.g., an elastic compression garment maymake a convenient cover.

4. Preamplifier Handling Precautions: The preamplifiers used with the Utah Arm are very sensitiveelectronic devices, thus they require proper handling to avoiddamage by static electricity.

a. Discharge yourself to the ground (center) electrode, orblack plastic back, before touching any other part of thepreamp, each time they are handled.

b. Avoid working on the socket with static-producingequipment (buffers, drills, etc.), after the preamps have beeninstalled. If the preamps could receive a static discharge,remove them.

c. Do not tug or jerk on the preamp connector wires,especially when disconnecting them. Be sure to pull on theconnector, not the cord.

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d. Do not place the wires where they might be pinchedduring assembly of the sockets, or other situations.

e. The electrodes should be connected to the preamp withthe wire set supplied with the Utah Arm fitting kit (Anoptional long set, 16” [40.6 cm] is available).

5. Connections:a. 4-40 Screws, nuts and lock washers provided are used

to fasten the wires to the preamps and electrodes. A set ofminiature nuts is also provided.

b. Avoid a location where the preamp must be bent ortwisted, i.e., locate them on a flat surface formed by fittingand/or sanding, if necessary.

c. Avoid a location where the outer socket could rub thewires or connector. If the socket rubs over the preamp orwires, cover it with duct tape.

Note: If the socket or frame is laminated with carbon fiber, itis conductive. Insulation of the electrode from the socket isessential. Check for sharp edges on back of electrodesshorting to outer socket. (Use heat shrink tubing over theelectrode threads; use heavy duct tape over the nuts).

d. STANDARD CONNECTIONS: The factory settings inthe U3 Arm will operate the Hand in this manner:

“UP” = A Channel = Open Hand/Wrist Clockwise

“DOWN” = B Channel = Close Hand/Wrist Counterclockwise

6. Testing Wires:a. Perform the continuity test on all the electrode-to-

preamp connectors, to insure no wires were accidentallybroken, or improperly connected. Set the multimeter on“ohms” and zero the meter; you should measure close to “0”ohms for each wire. (See Figure 3.4) Also test between theground of the preamp, and both sensing electrodes. Youshould read infinite ohms, indicating no accidental shortshave occurred. (Fig. 3.5)


Instruction ManualU3FIGURE 3.4 TEST ALL THREE WIRES TO EACH PREAMP FORCONTINUITY, AND MAKE CERTAIN ALL NUTS AND SCREWS ARE TIGHT.

FIGURE 3.5 TEST ALL WIRES FOR AN ACCIDENTAL SHORT TO GROUND.

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7. Insure Adequate Grounding:Always use two ground electrodes, connected with wires

to the center input of each preamp.The Ground electrode does not need to contact the

control muscle. Position them over fleshy, non-muscled skinareas, and on generally opposite sides of the remnant limb,to insure ground contact on at least one electrodethroughout the full range of motion of the prosthesis.

8. Prevent Moisture Damage:a. Avoid moisture from perspiration (or any other source)

on or into the preamps.

b. Holes in the socket which could leak perspiration tothe preamps must be filled in.

c. If a drain hole or pull-sock is necessary in the bottomof the socket, it must drain the moisture to the outside, notinto the space between the inner and outer sockets.

d. If an outer socket is not covering the preamps, theymust have a moistureproof cover and protection from blowsor other damage.

e. We DO NOT recommend potting the electrode studswith RTV silicone. The silicone can insulate the electrodethreads, resulting in loss of signal.


Instruction ManualU39. Sweat Damage Prevention:

(for high sweat and humid climates)The following steps are strongly recommended for all UtahArm wearers who have the possibility of dripping sweat intotheir socket, or into the elbow itself. Sweat can cause damageover time, by corroding connectors and wires, and causingelectrical shorts.

a. Protect the connectors and joints at the top of the UtahArm. Fill all the connectors with silicone grease provided– itprevents water from entering the connector. Also, run a beadof the silicone grease around the mating surface of the ElbowCap, then screw the Cap tightly into place.

b. If the wearer produces excess perspiration(hyperhidrosis), precautions must be taken. Antiperspirantpreparations and/or absorptive axilla pads may help, or aprescription for a strong topical antiperspirant, e.g., DrySol,may be needed.

c. Prevent sweat from dripping into the forearm andcollecting in the lock strip slots. Preventive Step: Send theUtah Arm (forearm only is required) to Motion Control and wewill drill a small hole at the base of the Forearm StructuralPiece, which will allow sweat to drain out of these slots.

d. Prevent sweat from dripping into the interior of thesocket, and down to the connector area. Preventive Step: Sealthe frame and socket together at the axilla with RTV silicone,so that sweat cannot drip into the inside of the socket. Also,make a large enough hole into the side of the base of thesocket so that a highly absorbent sponge or a syntheticchamois cloth (available at camping stores) could be placed inthat space, or a “sweat band” like a tennis player wears,could be worn around the socket. The wearer could thensqueeze out the sponge or sweat band during the day.

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Notes:


Instruction ManualU3FIG 4.1 DETAIL OF FOREARM CONNECTION SYSTEM

FOREARM COVER WITHMOUNTING RING

FOREARM COVERWIRE SETConnector automaticallymates when Forearm Coveris installed.Wire Set installed inForearm Coverautomatically makes allconnections for Hand andWrist. (See Fig. 1.2)

WIRE SETThe distal end of the Forearm Cover Wire Set isaccessed by disassembly of the coaxialconnector/lamination collar.The ring mechanism which mounts at the proximalend of the Wire Set is not removable.

ADJUSTABLE FOREARM LENGTH•Shorten up to 1 inchShorten up to 1 inchShorten up to 1 inchShorten up to 1 inchShorten up to 1 inch (2.5 cm) -remove Wrist Lamination Collar, bond theLam. Collar with Siegelharz (roughensurfaces, clean w/ solvent, then bond).• Shorten up to 2 inch Shorten up to 2 inch Shorten up to 2 inch Shorten up to 2 inch Shorten up to 2 inch (5 cm) - sendto Motion Control for factory modification.• Lengthen up to 2 inch Lengthen up to 2 inch Lengthen up to 2 inch Lengthen up to 2 inch Lengthen up to 2 inch (5 cm) -install an Extension (p/n 3010067-Cauc.or 3010068- Blk)

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D. Connections

USING A REMOTE POWER SWITCH:

11111. Connect one of the remote powerswitch options (see p. 35) to the 5-wireharness. (Touching an electrode in the“Electrode kit” is equivalent toactivating a switch.)

2.2.2.2.2. Slide both Dip Switches on theRemote Power Switch Circuit (seediagram) to the left. To switch the poweron or off, hold the switch for 1/4 second.

3.3.3.3.3. If a longer switching time is desired,slide DIP switch #1 to the right side.Now the remote switch must be heldcontinuously for 3 seconds to switchthe power ON or OFF (preventingaccidental switching).

SLIDE BOTHBOTHBOTHBOTHBOTH SWITCHES TOLEFT LEFT LEFT LEFT LEFT TO ENABLE REMOTEPOWER.SLIDE SWITCH #1SWITCH #1SWITCH #1SWITCH #1SWITCH #1 TO RIGHTRIGHTRIGHTRIGHTRIGHTFOR 3-SECOND SWITCH TIME.

Remote Power Switch Circuit(Requires 5-wire harness)**

**OPTIONAL AFTER JAN. 2006**OPTIONAL AFTER JAN. 2006**OPTIONAL AFTER JAN. 2006**OPTIONAL AFTER JAN. 2006**OPTIONAL AFTER JAN. 2006(Installed at Motion control at no charge)

HAND CIRCUIT CONNECTORMicro-D-Miniature (MDM) connector - Lines upautomatically when Forearm Cover is installed.


Instruction ManualU3Installation of a Passive WristRotatorStep 1. Assemble the coaxial connectorSlide the coaxial connector through the center of

the coupling piece and line up the square tab onthe coax with the slot in the coupling piece.

COAXIALCONNECTOR

COUPLINGPIECE

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D. Connections

Step 2. Attach the coax ringUsing a small screwdriver or tweezers, press the

plastic coax ring around the inner base of thecoax plug.

NOTE: The plastic coaxial ring has a ridge on theinside and only goes in one way. If you run yourfinger around the diameter of ring, you shouldbe able to feel a flat side and a rounded side.

Install the ring FLAT SIDE DOWN.


Instruction ManualU3Installation of Electric Wrist RotatorStep 1. Attach the Hand and Wrist control cablesConnect the hand and wrist control cables (see

detail on following pages). Put the electric wristassembly into the prosthesis forearm and makesure it is seated properly in the lamination collar.The wrist rotator has ridges on the outside thatwill line up with slots in the lamination collar--rotate the wrist rotator until you feel it clickdown into place, then continue rotating until itfeels secure.

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D. Connections

Step 2. Attach the coupling ringUsing a small screwdriver and/or tweezers, press

the plastic ring around the outer base of thecoupling ring. Make sure it sits inside thegroove of the lamination collar.


Instruction ManualU3FIGURE 4.2 DETAIL OF CONNECTIONS OF THE U3 FOREARM COVERWIRE SET-- DISTAL END:

ORANGE AND RED WIRESCARRY SIGNALS FOROPEN AND CLOSE,WHENANOTHER MANU-FACTURER’S TD IS USED.

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D. Connections

Notes:The Forearm Cover Wire Set is not to beremoved from the Forearm Cover except byMotion Control. The Ring Mechanism isfactory installed into the Forearm Cover andis not field serviceable.

WE NO LONGER RECOMMEND REMOVAL OF THE ELBOWTRANSMISSION FOR ANY FIELD SERVICE. BECAUSE OFTHE CHANGES IN THE TRANSMISSION, REMOVAL IS AMORE DIFFICULT OPERATION THAN BEFORE.

IN THE ELBOW TRANSMISSION, THE SLIP CLUTCH (OFUTAH ARM 1) HAS BEEN REPLACED WITH A RESETTABLEFUSE, WHICH INTERRUPTS POWER TO THE MOTOR WHENIT BECOMES HOT– THIS MAY OCCUR AFTER ABOUT 45SECONDS OF CONTINUOUS LIFTING AT MAXIMUM LOAD.

FIGURE 4.3 CONNECTIONS TO OTTO BOCK ELECTRIC WRIST ROTATOR


Instruction ManualU3To make adjustments via the computer and the UserInterface, connect the Computer Interface Cable tothe 4-pin connector on the U3 elbow as shown in thefigure below. Connect a TD and turn the Arm ON.

The Computer Interface Cable plugs into the elbow of the UtahArm 3, allowing the arm to communicate with the computer.

If your computer has no Serial Port, use a Keyspan brand USB/Serial Port adapter #USA19QW. (Motion Control PN:1800075)Be sure to install the software for the USB/Serial Port adapter.

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D. Connections

Humeral Connector System:The micro-D-miniature (MDM) connector system will

allow you to connect a one, three, or five-wire harness to theUtah Arm, depending upon the number of control options youdesire. The 3-Wire Harness is supplied standard with theUtah Arm 3, or if you prefer, when ordering, request the1-wire or 5-wire harness.

Caution:Caution:Caution:Caution:Caution: Never insert any probe into the MDMconnector pins. If you deform the tiny hollowsockets in the MDM, the entire Wire Set will needto be replaced.

Humeral Connector System Options:1. “ELBOW” - Connects to EMG Preamplifier Set, or Alternate Inputs:

(see below). For “Same Input” set up, the Elbow input is used tocontrol both Elbow and Hand.

2. “HAND” - Input for the Hand only. Same choices as for ElbowInput.

3. “SWITCH” - Use with desired wrist control switch.4. “LOCK” Cable - 2-pin connector for remote locking and unlocking.5. REMOTE POWER SWITCH (unlabeled)- 4-Pin connector.

( After Jan. 2006, must be installed at Motion Control).


Instruction ManualU3Alternate Inputs:

FIGURE 4.6 U3 CONTROL AND SWITCH OPTIONS

Note: After January2006, installation ofthe remote powercircuit is optional.See pg. 25.

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D. Connections

FOR LOW-PROFILESWITCHES,CALLMOTIONCONTROL.


Instruction ManualU3E. Software Installation Instructions:• Insert CD or 3.5” floppy disk into your computer (PC) and

double-click on the file named “WinU3&PC2inst.exe.”

• A pop-up window will appear asking if you want to installthe program; click “YES,” then indicate where you wantthe software to be installed on your computer.

• It will automatically load on your “C” drive in a foldernamed “Motion Control” unless you specify otherwise.Click on “Unzip” to start the download.

• When the self-extractor is complete, you will see a messageindicating the software has loaded successfully.

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E. System Set Up

• You will then see two new icons on your desktop labeled“U3 & PC2” and “U3 & PC2 Demo.” Choose the demo tosee a demonstration of the software without connectingthe Arm parts. Otherwise, choose “U3&PC2” to beginusing the software. Note: If you are running otherWindows programs while using the Utah Arm 3, yourcomputer monitor may switch to a different viewingresolution. Your normal settings will return when youexit the Computer Interface software.

Note: It is only necessary to load the Computer Interfacesoftware onto your system once.

Click on the “U3 & PC2” icon to get started.

To Operate the User Interface:Note: Be sure the U3 Arm is turned “ON” and a fresh

battery is installed.

• When you are prompted to do so, choose a COMM port thatthe Utah Arm 3 will use to communicate with yourprosthesis. The system will quickly verify yourcommunication is working properly and then you will seethe Main Menu screen.


Instruction ManualU3• If connection does not occur within 10 seconds, recheck all

connections, change battery, and make sure power switch isON. If all else fails, reboot your computer, with thecomputer cable disconnected. You can also try reinstallingthe User Interface program.

Click on Utah Arm 3 and“NEXT” to proceed.

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E. System Set Up

System Set UpThe U3 Computer Interface uses a Set Up Wizard that will

guide you through the process of setting up your system, oryou may take a shortcut directly to the Set Up Summaryscreen or the Hand and/or Elbow adjustment screens.Instructions follow for each step in the Set Up Wizard. Userswho are familiar with the User Interface may wish to godirectly to the adjustment screens.

FIGURE 5.1. ORGANIZATION OF THE USER INTERFACE SCREENS. YOUWILL USE THESE SCREENS TO CHANGE AND SAVE YOUR ADJUSTEDSETTINGS. BUTTONS ON EACH SCREEN ALLOW YOU TO NAVIGATEFROM ONE SCREEN TO ANOTHER.

Choose the Set UpWizard to customizeyour system.


Instruction ManualU3Step 1. Select U3 Configuration

• “Simultaneous” Elbow and Hand control allows thewearer to operate the elbow and the hand (or wrist) at thesame time.

Note: This configuration requires separate inputs for theelbow and hand.

• “Sequential” Elbow and Hand control is the same as theU2 operation. That is, control will sequence through theelbow and hand (and wrist, optionally). The elbow must belocked for the hand to operate.

Choose between “Simultaneous” and “Sequential” controlmodes.

Notice the Set Up Wizard provides a summary of thechoices you make as you go along. You may change yourselections by clicking on the “Back” button, or go to theSet Up Summary.

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E. System Set Up

Step 2. Select Elbow Control InputIf using EMG control for the elbow, choose “Utah Arm

Preamps.” For other inputs, choose “Alternate” Inputs.Indicate if you will be using dual or single channel inputs.Make your selections and click on “Next.” Note: If you chose“separate inputs,” you will also need to specify the inputs forthe Hand on the next screen.

With Dual-channel EMG, you may choose “Differential” or“First Over”.

• Differential: Uses the difference between the two signalsto run the elbow.

• First Over: Runs on the first signal to cross over thethreshold and ignores the other signal. Best used forwearers who have a lot of co-contraction. The only“downside” for the wearer is, to reverse the direction of theHand or Elbow, the first muscle must relax below threshold.

Step 3. Hand Control InputSame as elbow control screen. (Not shown if “Sequential”

and “Same Inputs for Elbow and Hand” are both chosen.)


Instruction ManualU3Step 4. Electric Wrist Control option

Indicate whether or not you will be using an electricwrist. If yes, you must specify if you will be using Version Aor B. Use one of the switches specified on page 36.

NOTE: WRIST SWITCH OPTIONS ARE DIFFERENT FOR U3 VS. U2.

• Version A Wrist Control - Redirects Hand control to wrist.

Advantage: Proportional, may not require an externalswitch.

• Version B Wrist Control - Switch activates wrist.

Advantage: Simple, simultaneous.

Note: If you use simultaneous control, then Hand/Wristswitching is possible by co-contraction (or high-rate of asingle channel input). In this case, an external switch isnot essential, though it might be useful as a backupmethod. (If a switch is connected, both co-contraction andthe switch will cause Hand/Wrist switching.)

43

E. System Set Up

Step 5. Automatic Terminal DeviceDetection

The U3 can be used with 2 types of TDs:

Type 1. Motion Control Hand or ETD (standard version),interchangeable with some Otto Bock TDs– 8E37 Hand;8E32=12 Greifer (specifically made to use with the UtahArm).

Type 2. Hands and TDs with In-Hand Controllers, forexample, the Otto Bock Sensor Hand (this choiceautomatically connects a 7.2 v. battery supply to the TDs).

The U3 will “Auto-detect” either type of TD connected, inthe 2 seconds after you turn it on. The ‘beep’ heard duringthis 2 seconds may be turned off in the “Hand Menu; UserSettings screen.”

IMPORTANT: Turn U3 power OFF when changing from aType 1 to a Type 2 Terminal Device.

NOTE: Warranty of non-MC TDs is at the discretion of theTD manufacturer.


Instruction ManualU3Step 6. Set Up Wizard Complete!

This screen shows a summary of all the choices you havemade so far. From here you can go to the Hand or ElbowMenu to begin adjustments, or go to the Set Up Summaryscreen to make changes to your selection.

A. Set Up SummaryDouble-Click on any item directly to make changes to your

selection.

45

E. System Set Up

B. Elbow Main Menu (Hand menu on p.50)

Look and Set screens-Four screens are available: •Elbow settings (for most

adjustments); • Lock/Unlock; • Freeswing/Relax Timer;• Save/Recall Settings.

User Settings-Allows you to change polarity and lock/unlock options.

Hand Menu-To make adjustments to your Hand control.

Set Up Wizard-Returns to the Set Up Wizard.

System Parameters-To change the COMM port and check hardware and

software settings.

U3 Elbow Controller Main Menu


Instruction ManualU3F. Elbow Adjustments–Dual Site EMG

Begin by clicking on “Look and Set” to advance to theElbow Settings screen to make adjustments and/or forpatient training.

(Dual site EMG shown. See p. 50 for Single site)

The Columns :1 and 2: A and B Channel Gain - These are the

sensitivities of the A and B channels. You can change themto balance flexion/extension sensitivity. (See “To AdjustGains or Thresholds” below)

3 and 4: A and B Output - For training muscle strength,or strength of output. This helps the wearer to visualize thesignal generated by their inputs and to develop bettercontrol. Notice that the blue columns (input strength) willreach higher values with higher gain settings. The mainpurpose of the Gain is to balance the muscle EMG or otherinput. The purpose of the Threshold is to preventunintentional motion of the Elbow. The Elbow will not moveuntil the input exceeds the Threshold.

Dual-Site Elbow Settings

47

F. Elbow Adjustments

When the control method is set to “Differential:”5. Motor Power: For training muscle (or other input)

difference. The bigger the difference, the greater the motorpower. The U3 computes the difference between the A and Binput signals to operate the Elbow. This “difference,” afterfurther electronic processing, operates the Elbow motor, andis displayed in the Motor Power column.

The Motor Power can be very useful for training, whenthe wearer realizes that the strength of the input differenceis what actually makes the elbow move.

For example, if you are using EMG inputs, if the wearer’sA and B EMG signals contract equally, i.e., co-contract, theycancel out and there is no difference between the A and BEMG Outputs, and thus no movement of the elbow. Thewearer must develop enough independence between the twomuscles for the Motor Power to reach a value ofapproximately 10 on the scale to move the elbow.

When the control method is set to “First Over:”In First Over Dual Site EMG, only the first muscle to

cross the threshold controls the elbow. To reversedirections, the first muscle must relax below the thresholdand the second muscle must contract above the threshold.We recommend this mode for patients with a high level of co-contraction.

To Adjust Gains or Thresholds:Identify the weaker of the two inputs-- less motor

power is generated when it fires.

1. Highlight the gain you want to change using the arrowkeys.

2. Raise the setting by pressing the “+” key on yourkeyboard (you don’t have to shift– just press the key). Or,lower the setting by pressing the “-” key . You will see the


Instruction ManualU3value change in the window below the column (Use the “pageup” or “page down” keys to increase or decrease by 10points at a time).

The U3 immediately changes the value, so the wearer canimmediately try the new setting each time you change avalue. Repeat this adjustment process until the wearer feelsthat raising and lowering the elbow require equal effort.

3. To SAVE the value you changed, select the Save/RecallSettings button. The Save/Recall screen will automaticallyappear whenever you have changed a setting, and go toanother screen.

Summary of EMG Settings:1. GAINS: Test for equal effort to raise and lower the

elbow. Balance the effort, if needed, with the A and B Gains.2. THRESHOLDS: Test for unintentional motion when

the elbow is positioned throughout the working space.Raise the Threshold, if needed.

3. QUICK/SMOOTH SETTING: Let the wearerexperiment with the different options, realizing there is atrade-off between speed and control.

Choose “Quick” for quickest response.Choose “Medium” for balance between “Quick” and

“Smooth” settings.Choose “Smooth” for jittery muscle signals and added

control (but slower).

49


Elbow Adjustments -Single Channel Input Settings

How “Single Site” control works:Using the Single Site Elbow control option, increasing the

signal raises the elbow and decreasing the signal lowers theelbow. The input signal is proportional to the level of thesignal, so slow and fast speed is under the control of thewearer. [You may reverse polarity on the “User Settings”screen, if desired]

HOME THRESHOLD: Determines when the Elbow willstart running, as the Input Signal is raised. Its purpose isto prevent unwanted motion of the Elbow from smallfluctuations of the input.

Single-Site Elbow Settings


Instruction ManualU3Lock/Unlock - Dual Site Inputs

Use this screen to help train wearer to switch between Handand Elbow. Input signals are shown to help with training.

Steps To Unlock:

1. Relax until “Relaxed” light goes on.

2. Co-contract (or generate alternate input signal) so both targetrates are exceeded.

3. The border of each column flashes GREEN when co-contraction is successful. This feedback may help train thewearer to flash both borders green simultaneously.

• Switch Window: Time allowed between two musclecontractions (or other dual inputs). Increase if contractions arenot simultaneous.

51


Target Rates1. Watch the Switch Rate signals as the patient attempts to

co-contract to unlock.

2. Set the Target Rate at ~80% of the maximum switch ratesignal, for each channel.

3. The wearer should be able to consistently reach the TargetRate. When this occurs, the border flashes green.

4. When both borders flash green unlocking will occur.

Lock TimeElbow must be held still for this time to lock (suggested

starting: 1.0–1.25 sec.). Longer lock time prevents accidentallocking. Time can be shortened after a few weeks of practice ifthe wearer desires.

Lock/Unlock - Single Site or Alternate InputLock/Unlock - Single Site or Alternate InputLock/Unlock - Single Site or Alternate InputLock/Unlock - Single Site or Alternate InputLock/Unlock - Single Site or Alternate Input• Same as dual site unlock, except with a single input. Note:

To unlock, Rate must be higher than Target Rate for bothrising and falling signal, so train the wearer to contract andrelax quickly.

• Raise Target Rate, if needed, to prevent accidentalunlocking.

• Lower Target Rate, if needed, to allow easy unlocking(suggested starting: 40%)


Instruction ManualU3Freeswing/Relax - Dual Site Input• Freeswing occurs when total muscle signal (A + B) falls

below freeswing level.

• Adjust the Freeswing Level so wearer can relax below it,whenever Freeswing is desired.

• Relax Time: Prevents accidental unlock by requiring apause before unlocking. Input signal must stay belowhome threshold for this time.

53


FFFFFreeswing/Rreeswing/Rreeswing/Rreeswing/Rreeswing/Relax - Single Sitelax - Single Sitelax - Single Sitelax - Single Sitelax - Single Site Input See Input See Input See Input See Input SettingsttingsttingsttingsttingsFunctions are the same as for dual-site inputs.

When you have finished with Elbow Adjustments,return to “Main Menu,” then “User Settings” to makechoices below.

User SettingsElbow Polarity - reverses the direction of the elbow.

Lock/Unlock - use the computer to unlock or lock.Note: User Feedback (beep and buzz) are all enabled on theHand Menu; User Settings).


Instruction ManualU3G. Store and Recall Settings

Store and Recall: Automatically comes up every timeyou exit a screen if changes were made to settings.

The left column, labeled “PREVIOUS”, indicates settingsfrom AutoCal or the last saved settings. The right column,labeled “ADJUSTED”, shows the latest changes you madeon the last screen you were on. The middle column showswhich settings are being affected.

The buttons at the bottom of the screen give you thefollowing options:

1. SAVE adjusted settings and Proceed-- keeps thechanges you made.

2. PROCEED without saving adjusted settings - retains“previous” settings shown in the left column.

Store and Recall Settings

55

G. Saving Adjusted Settings

3. RECALL starting settings - recalls “original” settingsestablished at the start of session. These are the settingsthe program reads in from the U3 when the User Interfaceprogram is first started.

4. SAVE then go to computer file operations to store thesettings in your computer.

Computer File Operations:To save adjusted settings into permanent memory on your

computer. Follow on-screen directions to select a register,rename it, store settings, or retrieve settings. To retrievesettings, be sure Set Up Wizard has the same configuration aswhen they were originally stored.

Computer File Operations:

On this screen you can save the adjusted settings to yourcomputer’s hard disk for later use. This can be useful to


Instruction ManualU3compare the settings at the beginning of training with thoseafter training. Or you could save optimized settings, so youcan return to them after experimenting with other settings.

How to Save Wearer Settings to Hard Disk• Use the “Page Down” key to select Settings File 1 and

press <Enter>.

• Press delete or use the backspace key to erase the textand type in the patient’s name and <Enter>.

• Highlight the desired operation using the up and downarrow keys (i.e., copy settings from elbow to file or vice versa).Press <Enter> to perform the selected operation.

• When you are finished, go to “Leave this screen” toreturn to the screen you were previously on, or “HandSettings” to save your Hand settings file.

Note: When new versions of U3 or ProControl 2 softwareare loaded, the saved files are lost. Print the settings, or use“Full Feature” save (below) to save permanently.

57

G. Saving Adjusted Settings

How to Print Wearer ProfilesTo have a printed record of the settings you have used,

simply:

• Press the “PRINT SCREEN” key on your keyboard(usually to the right of the function keys).

• Open up a document in MS Word, or any software thatcan handle graphic images.

• Press “CTRL” and “V” at the same time, or go to theEdit menu and select Paste. A picture of your Settingsscreen should appear. Press “CTRL” and “P” or select Printfrom the File menu to print the picture for storage in thepatient’s file, or save to disk.

Full Feature SaveThis alternative save was added for two features:

• All settings, including Wizard choices are saved.

• Loading new software versions will not erasepreviously saved settings.


Instruction ManualU3H. U3 Hand Main Menu

The Hand Main Menu is the gateway to the Hand Settingsand allows you to choose adjustment screens, or changeuser settings for the Hand in the same way.

Hand Settings - Dual Site Inputs(These settings are chosen in the Set-Up Wizard)

EMG DUAL SITE (STANDARD): Hand power is theDIFFERENCE between channel A and channel B inputs.

“FIRST OVER”: Hand power is the output of the FIRSTSIGNAL ABOVE THRESHOLD. To reverse direction, themuscle (or other input signal) must relax. Use First Overwhen co-contraction of both inputs prevents easy operationof the Hand.

59

H. Hand Adjustments

Note: If the Hand on screen is running backwards from theactual TD, press “ALT” + “H” to reverse direction.

Hand Settings - Single Site EMG or AlternateHand Settings - Single Site EMG or AlternateHand Settings - Single Site EMG or AlternateHand Settings - Single Site EMG or AlternateHand Settings - Single Site EMG or AlternateInputInputInputInputInput

Steps to adjust SS input:

1. Adjust “Input Gain” so that “Input Signal” reaches100% with moderate effort.

2. Adjust “Output Gain” so that Hand control isoptimized.

3. Adjust “Home Threshold” to prevent accidental motionof the Hand.



NOTE: THE SINGLE SITE CONTROL SCREEN IS DISPLAYED IF “SINGLECHANNEL INPUT” IS CHOSEN IN THE SET UP WIZARD.

How “Single Site” control works:Using the Single Site Hand/Wrist control option,

increasing the signal closes the hand and decreasing thesignal opens the hand. The closing power is proportional tothe level of the signal, so slow and fast closing speed isunder the control of the wearer. [You may reverse polarity onthe “User Settings” screen, if desired]

If you have chosen the Wrist Option, be sure the “W”output cable is connected to the wrist rotator (see p. 30 fordiagram).

To switch control to the wrist: the wearer relaxes, thencontracts and relaxes quickly (and lightly) to switch to wristmode. The same rapid/light contraction returns control tothe hand.

61

H. Hand Adjustments

HOME THRESHOLD: Determines when the Hand willstart running, as the Input Signal is raised. Its purpose is toprevent unwanted motion of the Hand from small fluctuationsof the input.

MIDPOINT: This is the level the signal must fall belowto reverse direction. The Midpoint automatically moves justbehind the output, so that reversing Hand direction is easy.The wearer has only to relax the Input signal to reverse theHand direction. This value is not adjustable.

ALTERNATING DIRECTION WRIST CONTROL:Choose “yes” or “no” by clicking on the button. If “YES”,when control has switched to wrist, the direction of thewrist motion reverses each time the Input signal falls belowthe Home Threshold for a length of time given by the sleepdelay (see Sleep Timer screen).

Switch Control (if wrist is installed)Dual Site EMG or Alternate Inputs

When “separate inputs” are chosen in the Set Up Wizard,the U3 uses co-contraction, i.e., a simultaneous contractionof the two control inputs to switch between Hand and Wrist.“Fast Access” wrist switching is also available, if enabled(simply click on the menu button).

Note: If “same inputs” are chosen for Elbow and Handin the Set Up Wizard, then co-contraction is dedicated toElbow unlock.

Switch Control: This screen helps you to train a patient toswitch between Hand and Wrist functions (if the wrist isinstalled). You can fine-tune the setting for Switch Rate A andB and the Switch Window (Outputs are also shown here, tohelp with training). Note: If the Electric Wrist is notplugged into the U3 Wire Harness, the Switch function isnot enabled, and thus will not occur.



In the A and B Switch Rate columns, the wearer’sactual Switch Rates are shown (in pink, on the left), alongwith the Target Rate settings (in yellow, on the right).

In order to switch by co-contraction, the wearer’s goalis to co-contract so that the A and B Switch rates (pink)“jump” up to the Target Rates (yellow) at the same time. Ifsuccessful at reaching the Target Rate, the border aroundthe Switch Rate graph will flash green. If a co-contractiontakes place, the “Wrist Selected” light will turn yellowuntil the user relaxes below threshold. Then switchingwill occur.

Hand Selected & Wrist Selected: These indicatorslight to show which motor the U3 will operate. Theychange when the switching is successful.

Gray = offGreen = onYellow = waiting to relax

63

H. Hand Adjustments

The Switch Window (last column on the right) is theinterval of time allowed between the first input signalthreshold crossing, and the second input signal thresholdcrossing, to be considered a co-contraction. The wearermust learn to contract both control muscles at the same time(co-contraction) and at a quick rate.

Fast Access Switching:

One muscle contraction, performed quickly so the TargetRate is exceeded, will begin operating the wrist rotator. Thewrist function will stay in operation until both muscles relax(see “Note” below). This allows the wrist function to also beproportional. If co-contraction is also enabled, then eithermethod may be used to perform wrist rotation. [The SwitchRate border flashing green only occurs when the co-contraction function is enabled].

Note: Switching also requires that the “Relaxed” lightcomes on. The wearer must relax both Threshold musclesfor the length of the Relax Time. (To adjust, see below)

How to use the Switch Controlscreen to train the patient:Co-contraction Switching:

Instruct the patient to perform the following sequence:1. “Relax both muscles.” (On the Switch Control screen you can see

the A and B EMG outputs drop - they must drop below thethreshold on the EMG Output columns.) Then the “Relaxed”light comes on. (The Relax Timer may be changed if needed, seep. 67).

2.“Then, as quickly as possible, contract both muscles lightly.“(On the Switch Control screen you can see the A and B outputsrise– they need only rise to the Threshold level for each channel.You will also see the Switch Rate A and the Switch Rate B risequickly– these columns measure only the quickness of the EMGcontraction– so this column rises only during the start of thecontraction.)


Instruction ManualU33. “Train your muscles so that the A and B pink bars rise up

together, and make the blue border flash green.” Then theHand and Wrist lights change colors, in the lower left corner,showing that the function has changed .

Fast Access Wrist Control Switching:Instruct the patient to perform the following sequence:

1. “Relax both muscles.” (On the Switch Control screen you can seethe A and B EMG outputs drop - they must drop below thethreshold on the EMG Output columns.) Then the “Relaxed”light comes on. (The Relax Timer may be changed if needed, seep.67).

2. As quickly as possible, contract the A (or B) muscle enough toexceed the threshold. The Switch Rate A (or B) must exceed theTarget Rate for that muscle, then the wrist will turn on. (Forfeedback, the “Wrist Selection” light will also turn on. If Co-contraction is also enabled, the blue border will also flash green.)

3. As long as either A or B muscles are above threshold the wrist willremain on. The wrist turns off and control transfers back toHand, when both A and B muscles fall below threshold, and the“Relaxed” light comes on.

To make switching easier for the wearer:1. Lower the Target Rate setting on A and/or B. Select the

setting desired, then lower the Target Rate with the “-” key.Test: Ask the wearer to contract the muscle quickly enough to make

the border flash green. Lower the setting until successful.2. Decrease the Relax Time (see p. 67).3. Increase the Switch Window. Do this when the test in Step 1

shows the border flashing green, but the two muscles can notcontract simultaneously.

65

H. Hand Adjustments

A WORD OF CAUTION: Making switching easier canresult in switching “too” easily-- then the switchingoccurs unintentionally. Change the settings onlyas far as necessary. Also, let the wearer practicewith the screens.

“Practice makes perfect.”

Summary: To switch easier, lower the Target Rate settings. Watch the screen

and adjust settings to optimize the patient’s success. The Switch Window represents the time allowed between the two

input signals (as they cross the threshold), to be considered a co-contraction.

Make the time longer to make switching easier, if the signalscannot be generated simultaneously.

Make the time shorter to help eliminate accidental switchingduring Hand function.

If switching cannot be mastered, you may use a Wrist Controlswitch. See options on p.35.

Single Site EMG or Alternate Input Control:Works the same as dual site, except with a single input.

The “Asleep” light must be on for switching to occur.

(see Relax Timer screen)


Instruction ManualU3Relax Timer - Dual Site Inputs

Relax Timer: To switch between Hand and Wrist, the A andB inputs must first relax, i.e., EMG’s or alternate inputsignals fall below their thresholds. They must stay relaxedfor the length of this setting before the U3 will allow a Hand/Wrist switch.

The Relax Time is meant to ensure that quick openingand closing of the Hand is not mistaken for a co-contraction, thus causing an accidental switch.

Fast Access WristThe “Relaxed” light must turn on:

• to switch between Hand and Wrist,

• before a Fast Access Switch to Wrist, and

• after relaxing below threshold to return to Hand.

67

H. Hand Adjustments

How To Train The Patient & Fine-Tune theRelax Timer:

While training with the Switch Screen, notice the light atthe bottom of the screen, labeled “Relax.” This tells you andthe patient when the Relax Time has been reached, and co-contraction will switch from hand to wrist. Awareness ofthe relaxation which is required may help preventunintentional switching.

However, if during operation of the hand, the patientaccidentally switches, you can lengthen the Relax Time inthe Relax Time Screen. Boost it to .40 (starting is .25), andthen explain to the patient that they must relax until the‘Relaxed” light is on, before attempting a co-contraction toswitch.

After training for a few minutes with the function of the“Relax’ light, then ask the patient to again test the fastopening and closing, to see if the accidental switching is stilla problem. If it is, increase the Relax Time. Test again foraccidental switching and train further using the SwitchControl screen. Continue this process, with training, untilno accidental switching occurs.


Instruction ManualU3Sleep Timer - SS EMG or Alternate

Input

Hand Sleep Delay - sets the length of time the Hand muststop for the Hand to “sleep”, i.e., for the Power to turnoff.*

Wrist Sleep Delay - sets the length of time the wrist muststop to go to “sleep.”

Seconds Until Sleep- Shows actual run time of the Hand orWrist going to sleep (border flashes green when sleepoccurs). This is useful for training.

*A feedback “buzz” may also be enabled to indicate whenSleep occurs (see the User Feedback screen below).Alternating Hand/Wrist Control- (see p. 53) When

Alternating Wrist or Hand Control is enabled, the Wrist orHand direction changes after stopping for the length of theSleep Time.

69

H. Hand Adjustments

User Settings for Hand(ACCESSED FROM THE HAND MAIN MENU)

Settings: In this screen you can disable or enable Auto-Cal, orelectric wrist control. You can also reverse the Hand or Wristpolarity (direction) or manually switch from Hand to Wristmode.

Hand Polarity:With this button you can reverse the direction of the

Hand function. Highlight the button, then hit the space baron your keyboard. The letter in the button will change from“A” to “B”. When “A” is selected, the A muscle will closethe Hand.


Instruction ManualU3Wrist Polarity :

This button reverses the wrist direction. The ‘A” in thebutton indicates the “A” signal will rotate clockwise.

The wires to the wrist coaxial connector (see p. 30-31)must also be installed with the “W” facing outwards forthese directions to be correct. The Hand wire has apolarized connector.

AutoCal Enabled by Hand Switch:(see discussion of AutoCal that follows)

If enabled, this triggers AutoCal when the Hand Switch isturned OFF and ON twice within 6 seconds (see p. 64).

Disabling/Enabling AutoCal: AutoCal can ONLY be disabled or re-enabled in this

screen. Click on the AutoCal Enabled button, and the wordin the button will change from “Yes” to “No”. Once disabled,AutoCal will not change the settings until you enable itagain. Every time the wearer turns it on, the U3 will operatewith the same saved settings.

Wrist Control Enabled:Click on the button to disable or re-enable Wrist Control.Note: If the electric wrist is not connected, the Wrist

Control will automatically be disabled by the U3.Sometimes you may wish to prevent accidental switching

to wrist (while training for Hand control only). With thisbutton you can disable (or re-enable) the electric wrist, if it isconnected.

Switch Between Hand and Wrist:Use this button to manually switch between these two

functions, for instance, when the patient cannot perform co-contraction successfully.

71

H. Hand Adjustments

User Feedback Options:Feedback Signals are used to provide feedback to the

wearer about the status of their system. Click on any of thebuttons to turn the feedback signals on or off, as indicated.

The “buzz” is caused by a vibration of the Hand motor–itmay be felt through the socket.


Instruction ManualU3AutoCal® automatic adjustment (for Hand)• AutoCal automatically sets Gains and Thresholds based on

wearer’s signals. If AutoCal is enabled, manual settings ofgain & threshold are not possible.

• After AutoCal is triggered, the wearer’s EMG is measuredfor (7) seconds. The wearer should open and close theHand several times within this period.

• Gains are adjusted automatically so that the Range= 0-100% of measured EMG.

• Thresholds are set automatically to 15% above relaxedEMG. Minimum AutoCal Threshold= 31%.

3 ways to start AutoCal®:(The “AutoCal” option is enabled on the User Settings screen.)

1. By Hand Switch - Turn the Hand off--then on again, twicewithin 6 seconds.

2. By pressing <Alt>+<A> on your keyboard (whileconnected to the computer).

3. AutoCal by Power Switch. AutoCal is triggered for the 7seconds after the Arm is turned on (wait 2 secondsinitially for auto-TD detect).

73

I. the AutoCal® Feature

AutoCal Instructions to the wearer:[Only if AutoCal is enabled-- see “User Settings” screen]

1. Don the prosthesis, and let the electrodes warm up to thetemperature of your skin. Depending upon the pressureof the electrode on the skin, and amount of sweat on theskin, this could take up to 10 minutes.

2. Turn on the Hand Power Switch, then contract theopening muscle, without straining, so that the Handopens.

3. Relax briefly, then contract the closing muscle, withoutstraining, so that the Hand closes.

4. Open again, and close again, without straining.

5. Relax - try to feel the light vibration generated in the Handat the end of the AutoCal seven second period. (See“Feedback Signals” on the User Settings screen)

6. After AutoCal, test your hand control - open and close theHand slowly, then quickly. You should be able to vary thespeed of the hand by the strength of your contraction.Your maximum speed should be controllable and notjittery. If co-contraction is utilized, test for the ability toswitch with co-contraction.


Instruction ManualU3Troubleshooting

When there is a problem with the prosthesis, approach it logically,with the help of the “Basics” section below and the Flowchart onthe following pages. For help from Motion Control technicians,

Call us at (888) MYO-ARMS or (801) 326-3434

Send a fax to (801) 978-0848 OR,

Send an e-mail to [email protected]

If necessary, send us the Arm or the problem component if youcannot solve the problem yourself. Always use the padded caseprovided to insure there is no shipping damage. Call or fax beforereturning repairs for a Return Authorization Number.

UTAH ARM TOOL LIST:Recommended Tools:

• Small screwdriver set• Voltmeter (V.O.M.)– with probes and alligator clips (any simple one

will do– read the instructions and learn how to use it)• Tweezers– fine point, surgical type• Alcohol for cleaning• Cotton swabs• Allen wrench – 7/64”• Myolab II with “T” cable (strongly suggested for muscle testing

during fitting and follow up)• Nut driver with 1/4” socket• Needle nose pliers• Electrical tape• Fibre tape or duct tape

75

J. Troubleshooting

Basic Checks:1. Check the Battery.

• Make sure the battery is charged until the status lightturns green.

• Inspect the battery contacts on both battery and holder.Clean with alcohol and cotton swab, if needed.

2. Check the Power Switch.• Check the switch for the Hand or TD used, as well asthe elbow power control. Consult the individualinstructions for all TDs. In the U3 Arm, the power doesnot actually come on for 2 seconds after you turn theArm on in order to perform the TD Auto-detect function.

3. Check the integrity of all connections:• Wire Harness for all electrodes, and the Humeral wireharness to the top of the Arm.

• Coaxial connector to TD

• Computer Interface connection to Arm, and:

• Serial port connection to computer

4. Check for Proper Electrode Contact in theSocket

• Confirm location of the electrodes over the optimalmuscle sites - retest if needed.

• Look for impressions of the electrodes in the skin.Make sure the skin does not pull away during the musclecontraction.

• Have the patient operate the Hand or Elbow - observethe muscle signals on the Computer Interface (if theelectrodes pull away from the skin, the EMG “jumps”suddenly). Use the Hand in all positions.


Instruction ManualU3 Define the Problem:::::

Analyze the Functions of the ProsthesisAsk the wearer to perform the functions of the Elbow, TDand/or Wrist:

• Flex and extend elbow. Relax to Freeswing.

• Open TD Fully

• Close TD fully & close to full force

• Switch to Wrist (if installed) by Co-Contraction or WristControl Switch.

Alternatively, use your own muscles to control theprosthesis using spare preamps with electrodes on yourown forearm. Touching the electrodes in the socket maymove the Hand, but don’t expect good function. Whenthe electrodes are not in contact with skin, interferencewill operate the hand unpredictably.

DIAGNOSTIC TESTS[ ] Free-Swing Test/Balance Load Cell

1. IMPORTANT: Unplug the Preamps from the Arm. Youmay need to detach the socket from the Arm to expose theconnector.

2. Free-Swing Test: With a fresh battery, turn the ArmON. Hold the Arm horizontally and gently flex the elbowback and forth. When free-swing functions properly, you willfeel very little resistance, even when changing direction.When horizontal, the Elbow will stay in the position at whichyou stop it, and will not tend to drive in either direction. Ifthe elbow drives when horizontal, the Load Cell must berebalanced.

77

J. Troubleshooting

3. To balance Load Cell, perform the Free-Swing Testabove, then:

a. Remove the Forearm Cover, then the belt from themotor.

b. Set the Arm horizontal on the flat surface of theForearm Structural piece.

c. Turn the power ON. The motor may spin slightly,then when you flex or extend the elbow with yourhands, the motor should spin faster or slower. If theelbow locks, unlock with the override button.

d. Find the load cell balance adjustment (on left side ofelbow, visible when fully flexed). Remove the protectivepaper dot.

e. Turn the adjustment slightly, clockwise or counter-clockwise until the motor stops. Note: There is a non-adjustment region on this potentiometer, when the blackdot is between the blue and the red dots, i.e., the loadcell cannot balance in this region. See figure 6.1 below.

f. Replace belt and forearm cover.

g. Perform Free Swing Test again. If the Arm still willnot Free Swing, it requires repair from Motion Control.

FIG. 10.1 LOAD CELL ADJUSTMENT POT

[ ] Continuity TestRefer to the instructions and figures 3.5 and 3.6 in Section 3“Preamp Installation.” To test fuses, use the same technique.Good fuses measure “0” ohms.


Instruction ManualU3[ ] REPLACING UTAH ARM 3 PARTSFIELD REPLACEABLE MODULES:FIELD REPLACEABLE MODULES:FIELD REPLACEABLE MODULES:FIELD REPLACEABLE MODULES:FIELD REPLACEABLE MODULES:

Battery PackHand or ETDForearm Cover (including connection system)Humeral Connector (5-, 3- or 1-wire harness)

NONONONONOT RECOMMENDED FT RECOMMENDED FT RECOMMENDED FT RECOMMENDED FT RECOMMENDED FOR FIELD REPLAOR FIELD REPLAOR FIELD REPLAOR FIELD REPLAOR FIELD REPLACEMENTCEMENTCEMENTCEMENTCEMENT:::::Elbow Drive TransmissionLoad CellLock DriveElbow CircuitsHand CircuitsFlexible Connectors

[ ] Battery Pack FUSE Test1. Perform a continuity test. Test both fuses. If the fuseresistance is infinite, it is bad.

2. Remove it by prying it out with tweezers.

3. Bend the wire leads on a new fuse, to match exactlythe old fuse.

4. Clip the leads to the same length as the old fuse.Then reinstall in the same sockets.

Note: Batteries can be checked without removing the fuseswith the U3 Fast Battery Charger.

FIGURE 10.2 BATTERY & FUSE (NOTE: THERE IS ONE FUSEON EACH SIDE OF THE BATTERY)

79

J. Troubleshooting

[ ] CHARGER TEST1. Plug the Transformer into a standard 120 volt wallsocket. (In other countries, a 220 volt Transformer issupplied.) Connect the transformer to the charger via themating connectors. All lights should be lit except forStatus.

2. Install the battery into the charger. The Status lightshould light yellow. Be sure contacts are clean anduncorroded.

3. Within 45 seconds after connecting the battery, thestatus light will turn red when charging.

FIGURE 10.3 U3 FAST BATTERY CHARGER

Note: If the status light never turns red, there is a faultin either the Fast Charger or the Battery Pack. Try adifferent battery pack in the Charger. If the sameproblem occurs, return the Battery and Charger toMotion Control.

4. If either Fuse 1 or Fuse 2 lights turn red, the fuse isfaulty on the OPPOSITE side of the battery pack, i.e., ifFuse 1 light turns red, then Fuse 2 is faulty. Replace thefuse, as described in Battery Pack tests.


Instruction ManualU3[ ] Jump Start(When the battery is dead and the elbow is locked).

1. Obtain a fresh 9- volt battery.

2. Remove the Utah Arm forearm cover.

FIGURE 10.4 JUMP START TERMINALS

3. Turn the power switch “off.”

4. Touch the “+” and “–” of the 9-volt battery to thematching terminal on the Hand Circuit. You should hearthe lock motor unlock, with a “whirr” sound.

5. Bend the elbow, remove the battery and replace with afresh one.

If all else fails and the arm will not unlock, return to Motion Controlfor repair. Be sure to call first and obtain a Return AuthorizationNumber.

CCCCCAAAAAUTION! DO NOUTION! DO NOUTION! DO NOUTION! DO NOUTION! DO NOTTTTT:::::Do not remove the Transmission.

Do not remove the Hand Circuit Boards.

Do not spray oils or lubricants into the Arm.

81

J. Troubleshooting

Computer Interface Problems

1. Basic Checks:• Make sure you opened the “U3 & ProC2” program, and not

the “U3 & ProC2 Demo” on your desktop.

• Check the integrity of all connectors.

• Try different “COM” ports. On the System Parametersscreen, select a different COM port from those displayed.If no others are displayed, the program requiresrestarting or rebooting the computer (see below).

2. Restarting and/or Rebooting:• Close the program and select “Restart” from you START

menu on the desktop.

• Unplug the serial or USB port while you restart.

• Plug in serial or USB port in ONLY after the desktopreturns.

3. As a “Last Resort”:• If you have another program on your computer which uses

the serial port inputs, it may not allow the MC UserInterface to connect there. The ‘OB Slider’ and Palm Pilotprograms have been known to create this problem.Uninstall these programs, then reinstall the User Interfacesoftware and try again.



4. “LAST RESORTS: The Sequel”:• If the COM port cannot be changed on the System

Parameters screen, it may be possible to change it in the“U3 & ProC2 Demo” program.

1. Open the “U3 & ProC2 Demo” program.

2. Navigate to the “Hand Main Menu” or “Elbow MainMenu.”

3. Open “System Parameters.”

4. In the COM 1 to COM 8 list change the choice to “COM4” (Many computers will default to COM 4).

5. Return to the “U3 & ProC2” program and try to connectagain.

5. “SON OF Last Resorts”:• Call our Technical Specialist Tariq Subhani at

1.888.MYO.ARMS (696-2767).

83

K. Patient Training

MOTION CONTROL HAS AVAILABLE A FREE TRAINING VIDEO FORTHERAPISTS (O.T.’S AND P.T.’S) TITLED, “TRAINING THE CLIENT WITHAN ELECTRIC ARM PROSTHESIS.” ALSO, FOR PRE-FITTING MUSCLETRAINING, REFER TO THE END OF THIS SECTION FOR A HOMEEXERCISE PROGRAM TO DEVELOP MUSCLE STRENGTH.

ELBOW-FLEXION TRAINING - EMG Dual Site(Alternate inputs instructions shown in italics)

1. Adjust flexion and extension gains on the forearm (seeAdjustments section). For all functions, a Therapy Cable(p/n 3010228) can be installed in the socket, allowing theArm to be used with the Myolab II to provide visualfeedback to the patient and act as a troubleshooting aidfor the Prosthetist.

With any Single-Site input, only the right side forearm gain isadjusted.

2. Practice elbow flexion and extension. First go to theLock/Unlock screen in the User Interface (see p. 51).Change the lock override button to “YES.” This enablesthe lock override button on the arm to override automaticlocking. Extension of the elbow is most easily performedby simply relaxing the muscles, controlling speed by thestrength of contraction.

With Linear Pot (or Force Sensor) input, flexion speed iscontrolled by the strength and speed of the pull on the sensor.

Activity: Follow a target with the hand; move the elbow fastand slowly. Also, practice holding in one positionsteadily.

3. Totally relax arm muscles occasionally and check forfree swing of the elbow. The elbow should drop, i.e.,extend very quickly, in free-swing. (The Prosthetist canadjust the Free-Swing Level, if required).


Instruction ManualU3LOCK-UNLOCK TRAINING1. Lock: Instruct the wearer how to lock the elbow:

“Hold the elbow steady at one position (without supporting itexternally). The elbow should lock quickly after themotion is stopped.”

(The prosthetist can adjust the Lock Time if needed. Earlytraining is usually easier with a longer Lock Time, helpingto reduce inadvertent locking while the wearer ismastering elbow function).

2. Unlock: Instruct in unlocking the elbow:

“Relax the muscles. Then flex both muscles quickly at thesame time, then relax, just like when a person ‘snaps’their fingers. You should hear a faint “whirr” when youco-contract successfully (from the lock motor). Then raisethe elbow slightly.”

(The elbow must raise slightly to release the lock).

“If the elbow does not unlock at the first attempt, relaxagain, then attempt the quick co-contract sequence. Don’tstruggle to unlock. Give yourself some time to practice,so you can develop the quickness required to unlock.Remember, contract both muscles quickly, not strongly.”

Adjustment can be made by the prosthetist to makeunlocking easier, or more difficult (if accidental unlockingis a problem). Training with the Myolab II will also bevery helpful, and is highly recommended. (Delaying unlocktraining until elbow and hand control are mastered canreduce frustration).

3. Practice lock-unlock activity: Position the elbow and lockat various positions. (Present a target with a pencil orfinger).

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K. Patient Training

Note: Unlocking, followed by a “jump” at the elbow is acommon problem, requiring some practice to correct. Tryto develop the feel in the wearer for raising the elbow justslightly to release the lock. Practice by presenting atarget requiring slight lowering of the elbow below theprevious locked position, i.e., lock, then unlock and lower(extend) the elbow, lock, etc. (It may be necessary tolower the forearm flexion gain to minimize the accidentaljumping).

TERMINAL DEVICE (HAND) TRAINING1. After the elbow is locked, the muscles must be relaxed

briefly, then control transfers automatically to the Hand.

2. Practice smooth opening and closing, developingindependence of the two control muscles.

3. Proper adjustment of the Hand control ( by theProsthetist) will allow opening and closing with equaleffort. If desired, a slight bias toward closing may beadjusted, so the Hand tends to close easier, avoidingdropping objects.

4. The arm wearer may practice controlling pinch force bygrasping their own sound hand (if unilateral) and feelingthe pinch force across the palm. Proportional control ofthe Hand will allow fine control of pinch force to bedeveloped, as well as control over the speed of openingand closing.

[CAUTION: Be Careful! Grasping delicate objects cancause harm due to the high pinch force of the Hand (~20lbs.). Wait until your control of the Hand, and the lock/unlock is excellent before you grasp other people!]


Instruction ManualU3TASK TRAINING1. Simple Grasping Tasks. Practice controlling the grip

force, gripping objects lightly and firmly. Practicestopping the Hand at full open, half open and nearlyclosed. Teach the best grips (for the particular T.D.) foreating utensils, especially knives, forks, mugs, etc.

Activity: Grasp blocks, cups, ping-pong balls, table utensils,cans, etc.

2. Practice Prepositioning. For a variety of everyday tasksyou might perform, practice positioning your shoulder,then elbow, humeral rotator and wrist, for the bestperformance, then open the Hand and grasp if needed.

3. Two-Handed Tasks. Start with simple tasks requiringholding an object to manipulate with the sound side hand(if unilateral).

Activity: Pull tape from a roll, remove a bottle cap, open asoda pop can, butter bread, hold toothpaste tube andunscrew cap, hold padlock and turn the key, etc.

4. “Grasp and Move” Tasks. Prepositioning is veryimportant for most tasks. Help the wearer to thinkthrough and practice the most efficient positioning of theelbow, humeral rotator and wrist rotator for each task.Working from simple to more difficult, work on the tasksmost relevant for the wearer. As much as possible, try totrain for the wearer’s specific needs.

Activity: Hold tray; hold mixing bowl; put clothes on ahanger; collate paper, fold and put into an envelope; drawlines with a ruler and pen; cut cardboard with an X-acto

87

K. Patient Training

knife; use knife and fork for cutting food (teach properknife grips for T.D. used); open and close zippers; threadand tie laces; buckles; hand tools: hammer and nails, “C”clamp, vice, hand drill, etc.

General Recommendations &Cautions1. Turn the power off when changing TDs.

When changing from one TD to another, ALWAYS turnthe power switch of the Arm OFF. Turn the Arm back ononly after the new TD is securely installed.

2. Turn the Arm off when driving.When driving an automobile or other vehicle, we

recommend that you leave the power OFF! An accidentalmovement of the Arm could distract you or interfere withyour control of the vehicle. Your arm can be used passivelyto steer, shift or use turn signals.

In addition, some types of electrical equipment can causethe Arm or Hand to move due to electrical interference. Forexample, Citizen’s Band (CB) radios (especially whentransmitting), have the possibility to move the Armunexpectedly. Even if you’re careful, a neighboring vehiclecould have a CB transmitter!

3. Avoid excessive moisture.Keep your Arm dry! Never allow it to get wet inside –

take it off before swimming, bathing, or showering! Werecommend that you not wear your Arm when you have to benear water. Be extremely careful around sinks, puddles andrainstorms. When you have to be near water, wear araincoat or waterproof jacket to cover it.


Instruction ManualU3If you have a Hand, the glove should always be worn. If

your Arm does get wet, dry it off as soon as possible andremove the Battery immediately! If water gets inside theArm, drain it by turning the Arm in all directions and notifyyour prosthetist or Motion Control IMMEDIATELY! Underthese circumstances only, remove the Forearm Cover and air-dry all parts.

Keep Your Cool-- Heavy sweating may result in erraticperformance of your Arm. Remember, your body has lesssurface area with which to cool itself. If you perspireheavily, dry off your skin and the electrodes. If necessary,use an anti-perspirant on your remnant limb to reducesweating.

4. Avoid Dangerous Situations.Be careful with your Arm! Dropping or jarring it could

damage the mechanism. If you ride a bicycle or motorcycle,or engage in similar activities, be careful and realize thedamage which could result. Do not use your Arm in thepresence of flammable gases. (In fact, you should probablyget the rest of you out of there too.)

5. Avoid dust, dirt and lint.DO NOT wear your arm to the beach or where sand could

get inside of it. When wearing clothes which produce lint,such as sweaters, wear a shirt or blouse underneath toprotect the Arm. If you must expose it to dirt, dust, lint,sand, or moisture – cover it with a tightly woven shirt sleeveand wear a protective glove. If dirt could get to the forearmholes, cover them with tape. This will help prevent dirtparticles from getting inside the Arm.

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K. Patient Training

6. Avoid extreme temperatures.Excessive heat or cold may damage your Arm – it

shouldn’t be left in a closed car in the sun or outsideovernight in freezing temperatures. In general, your Armshould only be exposed to temperatures at which youyourself are comfortable.

7. Avoid dyes.Your Arm can become permanently discolored and

stained by many commonly used substances. Dyes fromnewsprint and fabrics can be transferred; pencils, ballpointpens, and felt markers, even if not permanent, can causestains. Clean your Arm off immediately if it is marked inthis way. If your Arm includes a Hand, wear an outer glovewhenever appropriate to protect both your Hand and Arm.

8. Avoid excessive vibration.Activities such as operating a power mower, a

jackhammer, chain saw or other vibrating power equipmentshould be avoided with the Utah Arm, particularly thosethat are also dirty and may involve water.

9. Don’t lift heavy weights.Don’t attempt to lift more than 50 pounds with the Arm

locked. The Arm may be damaged with loads in excess of50 pounds.

10. Be alert to interference.When you wear your Arm in a new environment, notice if

any electrical devices can cause the Arm to move. If thisoccurs, leave the Arm OFF when you are around theinterfering device. If electrical interference causes aproblem for you, consult your prosthetist.


Instruction ManualU311. Use caution when donning and doffing.

Always turn your Arm OFF when putting it on orremoving it. Exercise caution in handling and donning yourArm as static electricity can severely damage the electroniccomponents when the Arm is not being worn. Whenever youhandle your Arm, touch a grounded point first, i.e., a GroundElectrode within the Socket (the electrodes not paired withanother). Have your Prosthetist show you the location of theground electrodes. Static electricity is not usually a hazardwhile wearing your Arm.

12. Leave the power OFF when not wearing theArm.Nearby electrical equipment can cause the Arm to move

when the electrodes are not connected to your skin.

13. Respect electricity.Do not connect the Arm to other electrical devices or

fasten it to other machines. The Arm will not insulate youfrom electrical hazards.

Only connect the Battery Charger to 110 volt, 50/60-cyclepower (in the U.S. and Canada). In countries where otherpower voltages are used, obtain an appropriate A/Cadaptor for 220 volt. If you are not sure, ask yourprosthetist.

14. Avoid solvents. Do not expose your arm to corrosive solutions, solvents

or vapors.

15. Don’t over-adjust or under-adjust.Do not overtighten the Humeral Rotator. Excessive

tightening can break the locking component inside the

91

K. Patient Training

Rotator, and in extreme cases, can cause the Arm to separatefrom the Socket.

16. Always make sure the Forearm Cover Screwsare tight.The forearm cover screws may loosen in the course of

normal use. Use a penny to tighten the screws.

17. Use only in strict accordance with the Directionsfor Use.Abuse will damage your Arm. Do not attempt to repair

your Arm beyond the instructions provided in this manual.Return the Arm to a trained prosthetist or to Motion ControlInc. for repair. Always ship the Arm in the case provided,with the battery pack removed.

Approach daily tasks with theattitude that your Arm is a uniquepiece of machinery that is a tool to

help you accomplish tasks andactivities of daily living.

Respect its limitationsRespect its limitationsRespect its limitationsRespect its limitationsRespect its limitationsas well as its capabilities,as well as its capabilities,as well as its capabilities,as well as its capabilities,as well as its capabilities,and it will serve you well.and it will serve you well.and it will serve you well.and it will serve you well.and it will serve you well.


Instruction ManualU3appendix a.Technical Specifications of the Utah Arm

Excursion Range: 135o

Excursion Time: With Myoelectric Hand TD: 1.20 seconds

Active Lift: 1 kilogram (2.2 lbs.) in the Terminal Device andusing a fully charged Battery

Load Limit: 22.7 kilograms (50 lbs.), locked

Humeral Rotation: Quick-Disconnect Wrist: 360o

Weight: Without Hand: 913 grams (2 lbs.)

Heat Tolerances:

Operating Temperatures: 0o to 44oC (32o to 110oF)

Storage temperatures: -18o to 60oC (0o to 140oF)

Maximum Current: 4.0 Amps

Quiescent Current: 50 mA

Battery Specifications:

Voltage: Rechargeable Nickle-Metal Hydride,

1100 mA HoursDual Supply, +7.2/- 4.8 Volts D.C. (total 12 V.)

Forearm Length: (from rearmost point of the Forearm to theend of the Wrist)Maximum: 27 cm (10 5/8”) (with forearm extensions)

Minimum: 20 cm (7 7/8”)

Electric Shock Protection: Class III, Type B

93

Index

Index

A

Acknowledgement 3Adjust Gains or Thresholds 47Allowable exceptions to normal spacing 17AutoCal Enabled by Hand Switch 70AutoCal Instructions to the wearer 73Automatic Terminal Device Selection 43

B

Balance Load Cell 76Basics of EMG Testing 10Battery Pack FUSE Test 78

C

CHARGER TEST 79Co-contraction Switching 63Co-contraction Training 13Computer File Operations 55Connecting Electrodes 19. See also ElectrodesConnections to Otto bock electric wrist rotator 31Continuity Test 77

D

Detail of connections of the U3 Forearm Cover Wire 30Detail of Forearm Connection System 24DIAGNOSTIC Tests 76Differential control method 47Disabling/Enabling AutoCal 70

E

Elbow Adjustments 46Elbow Main Menu 45ELBOW-FLEXION TRAINING - EMG Dual Site 83Electric Wrist Control option 41


Instruction ManualU3ELECTRODE AND PREAMP INSTALLATION AND HANDLING 15Electrode Installations in Socket 15

exceptions to normal spacing 17high profile electrodes 15low profile electrodes 15

EMG Testing and Training 10, 11Final Site Selection 14

External Parts of the Utah Arm 3 8

F

Fast Access Switching 63Final Site Selection 14First Over control method 47Forearm Connections 24

Wire Set 24Forearm Cover Length

Lengthen 24Shorten 24

Free-Swing Test 76Freeswing/Relax 52

G

General Recommendations & Cautions 87Grounding 21

H

Hand Circuit Connector 25Hand Menu 45Hand Polarity 69High Profile, low profile and snap-type electrodes 15How “Single Site” control works 49How to Print Wearer Profiles 57How to Save Wearer Settings 56Humeral Connector System 33Humeral Connector System Options 33

I

Installation of a Passive Wrist Rotator 26Installation of Electric Wrist Rotator 28Installing electrodes in the socket 16

95

Index

J

Jump Start 80

L

LOCK-UNLOCK TRAINING 84Lock/Unlock 50, 51Look and Set screens 45

O

Operate the User Interface 37

P

Parts of the Utah Arm 8Patient TRAINING 83

Elbow Flexion 83Lock-Unlock 84Task Training 85Terminal Device 85

PREAMP INSTALLATION 15, 21Connections 19Handling Precautions 17

Preamplifier Handling Precautions 18Prevent Moisture Damage 21

Q

Quick/Smooth Setting 48

R

Relax Timer 66Remote Power Switch Circuit 25REPLACING UTAH ARM 3 PARTS 78

S

Select the Elbow Control Input 41Select U3 Configuration 40Set Up Wizard 45


Instruction ManualU3Single Site EMG or Alternate Input Settings 49Single Site Input Settings for Freeswing/Relax 53Sleep Timer 68Snap Electrode Installation 17Software Installation Instructions 36Steps To Unlock 50Store and Recall Settings 54Sweat Damage Prevention 22Switch Control 61System Parameters 45

T

Target Rates 51TASK TRAINING 86Technical Specifications of the Utah Arm 92TERMINAL DEVICE (HAND) TRAINING 85Testing Wires 19To make switching easier 64Fine-Tune the Relax Timer: 67Troubleshooting 74

U

U3 Hand Main Menu 58User Feedback Options 71User Settings 45, 53User Settings for Hand 69UTAH ARM TOOL LIST 74

W

Ways to start AutoCal 72

u3 instruction - access prosthetics · preamplifier handling precautions 18 connections 19 testing...

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